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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fa3874e2c1cfa3128f1ea0f9ecdfbd2836cf301f53cb421b8bd2bb5707e1a6' 
  AND token = 'wVS5HgiWaDJc6koAuR2HDIN2YSCgJRTrcyA15U3FrZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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