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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcc6eac9e034985645d38f32b1689ee88d98d572a4023f697327772987390d6' 
  AND token = '5aulNPYIeWTU86i1SFFY5nB9O/PWmQMA9SK9Qikecn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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