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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d43b362f42233ff8df1041da50f200834dbef7a514f0c8b5474ba0a62f9745' 
  AND token = '0RQV6Ew108/kqgs2jN0pJDrk0SWFqW0xxeVMJI5JYdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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