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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51109f628623772f9cdc8c788a2ecaedcf4aecbc37b4f296d5d42eb71f06681' 
  AND token = 'xt9AxdVxwA7+o4t+kvNOWGC7/sT9q7/bGN24Xw5+swQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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