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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fced53ddbb3fd911cd8e525af4cc57de9896dab6eb624618a07545bd208f580' 
  AND token = 'aY/Qvf++dO5vYi8llWNI445rU1d98dwahSn1FcG9Oko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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