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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e5a4b96d2c591383698db43cc266e053e6153abaac37e0d1358c9dc3f9a4f9' 
  AND token = 'E9Z3e59zyPgOH3YKarkP0k0AzocazMt8K2HXkufIEu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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