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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24858e504b409337f103fabb4c64952a02e2948217fa4b6b12732a4e799d76f3' 
  AND token = 'PPgaoty5jSKUyXk5Rou1O8M5voPXMlpQaC9iKET7h+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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