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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c449fd8cdc3d3ef4c6dbcd5e1f70030cfc1ff08c38805f41a4bd55ff198fc3' 
  AND token = 'ikjuWjHlDzoVKGOcDOx5dGak17Qj/ozkwd1rQ5IgbQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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