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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf8a5433526bf3d76aa3a23df28d9d2a6bbaae5d760224d5e96734199c9c5ee' 
  AND token = '46ZTF66VJGebY17LshInUM/TbKI4n1Dlu1tRpbtjhzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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