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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda2364e19a6f0c3334ebbe2cac1d0746bde50f4d4cfd1d1c9304558d0d062bd' 
  AND token = '2WK6rOw2lomybLJ0Xg7B4IvyBjIHSHWplaakD9Iuqmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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