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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af1df1b0ba1ac918cd9685e23658353d99634d6c433d9d6578889ceb28d4866' 
  AND token = 'U0R97Qgzrk1yjebW3Yjk4+DPxQyclz6bzHQVupJiN5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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