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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4dff848aa346c1aef2558278428041b22ac902f4b68da70d7a2671ca3298f99' 
  AND token = 'q/05LO8NEMlD1w3koBAuODMttz/4UrAw7a5uFi3U1+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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