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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264651c747b7c3049282cd580585859f745157d27533d6362ae15f8c1341e3bd' 
  AND token = 'd3mYApMK82RcqTW/PN2AuWfN6mx2lhecC7r3f+onpZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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