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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f91ebacb78629f623cf3d6ebdaa4977329c3e9ee0848aa95b06bb35ab3cb82e' 
  AND token = 'vLZnbF7C7M1pq2k1nlE9/LbiLKRaOxwPLAJ62nJd5M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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