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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa19867d45098b5fa6d89798997e05efb5c093bdf2aeda7bf5754bf76b935ac' 
  AND token = 'VGKp0IxQBVBwRsh4QUqD+55QfhNEfeLJDtdY4OxBieQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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