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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f151ab8c93842919a894db8b7a4fd9091e00aea4bf6ae17710848d72d84e56' 
  AND token = 'i0V6OaG0gkV6IWfqnBC1RrRrC2ZbbLFylSXYrlU95a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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