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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e9c2a350c90d6c8f21f2ae866ed883e1f1792a330f3f0b56f0e21b328f07fb' 
  AND token = 'qlCFqHch9cqUVe9923e7LIuXZdu2ROJwKl7xfuQg4FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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