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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dd4bce92d27be9e30c3733c34778b8ca7b3aa408ec4c43d2ac16e2e3c52881' 
  AND token = 'wVXwQQbwOMST7zyJ4w8KkVSGkRcuTWPoQaRDZyCNRqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}