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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8fd5abbb9a8a27c873f1aa72d894474bde93424b9422200d42ae2d4d58941f' 
  AND token = 'b8G/j/QeZsHTSKnFqGU4q9xwT5ok70Zqxrf7/TFrmu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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