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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c21fd852335e3b5e16cb9367cea1f731825cfbbd041f7f9d6efcf45b5f49713' 
  AND token = 'g5VlcONQ0XitOhrXgCjk4IMtsChMOoUri3hwJ1BsQjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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