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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa9a569974fb6994fb34f511770af43c99e1f777a8da69178176b7b8d89f217' 
  AND token = 'A/y141rxrQC6mnh/A2zQ0/cNyiigh3rAwzDdIXfjXHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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