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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c293e4a40368de8bb6fdcf2e0d7dd09ae3136d4263dffe833718a2712c9ec2b' 
  AND token = 'wMf9yDOsl92EoYPmYv0BqkL81gww7Q9wX5tou0wMDgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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