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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d422dde32403edfa548c4b4dd44580c3710300dc58c6d824859e8e648b44ca1' 
  AND token = 'HWgQJrNmzWeI4aA8S3i7exoOgoEg3beUZ0QTtYtGCJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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