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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd371d9f557831a4b020a83c341c3ba99991126ceba60c5ab4d0eb970bab99187' 
  AND token = 'pscICPKRRr1XxoahxA3Fr2Yd2O8wZ8BMPQe0PIs4hTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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