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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da1a6ae8c6c2aac0206bebe22221f6b7505473cbc54c7cb65e6f4e8abf30aa2' 
  AND token = 'LKpT6YOSrgErQK6xepwMTN5ku0Uzn6Jy1rnAUb0VG24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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