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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c574fa343f064b01b9e02429db0add4bf12ee92ad739843f00a65974c412538' 
  AND token = 'HarIFyrRIgBFMOuQVlvfgyG9GV/yKMZGZ2TlDnErRY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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