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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03d160641db677c99d2153f9f9fc15666c4c7a89d9cf0030a6ad4432ccfcfb0' 
  AND token = 'w4wihVRqAyonxXbHyuLCVgoR8wsikeBWlKyeGUeMN8o=' 
  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"
    }
  }
}