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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1068884b4b92190bf31534084995a24cffd0c4ba47f0d7f4fbdeac4663e0fa' 
  AND token = '0Tl0VR3V1UqtXoabRPAYyxv5wQNUjuMPOGYkMacvr9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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