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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf2358e23e8b1056a61e07899ac8c62c4a571710b30c85010e1967a58750b69' 
  AND token = 'O1FMcf84hwuG9CND1jgex5zElU6GyGScPqnkGg7Y7o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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