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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facf1fe6ff60dedea03891d7902262fc8a9bf14f3ec0e42c930df4a229c6f759' 
  AND token = 'aL/t3cYJFJ9BI0CKYiSSB+m8U/+fiR1uedfQVR6Iqfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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