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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f2dcd83b0d97c9fd945c8fa86175aacc32cb2c3a4e7853a863925da3646163' 
  AND token = 'z/R9GbSOFC69vn8+oc3Q5b+o/A22IzNkdFXjLqpkGpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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