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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4fe5fa69256d15e3ba7da0a161561f1ebce57c551b022249b9af5dbf6242cc' 
  AND token = '7G5Vz+W9dy6Hfln1cKwhiuPXs+KZWqSTOI7w+bnygw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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