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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913d72c32a3f6d3a8238c2fdb7b47ff5b7a87d282f708bd615e5f608f05eb1ef' 
  AND token = '2KQLaapPNd8UdZm4X3GIl33tSqaOcyvNY3crkCr6R2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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