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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e64aff68e8e41eb3c2115a303b04c8be60d7ff80edd2ddff45e2eaeb5b05003' 
  AND token = 'VQpPJDQ74T8+usbbzIP4pA5JQoX6Y0+fMbg3V1Lp6TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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