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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58677fce5eee75f6807b2d03b9fe52137af4ce75dd9f2bad0c0e03497c7a223' 
  AND token = 'giZ4rFAdp2L6l/e9ZAbTb93R1aADgba7hA4ia7J3IyM=' 
  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"
    }
  }
}