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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1768d757cdb30762cb484c619f698f85b7622b053ab30611e1c64c1f573a1079' 
  AND token = '5+0y3TTWXDA8JlM1UHyodlx1i7Q1kWdDMqLvZsRF77g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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