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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c0a311dfd9c7a69dc768db2922634ca31953940ea9028786386ff62230e735' 
  AND token = 'kfBTOZtoIer+EBtz84CFnn4+MO40sWbcl0pk6jEUKUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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