Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb77f548bd0ce6ecba8eb53106905d7fb6d51bfbb58234b000fb73e43415ce83' 
  AND token = 'mtL+OrMG4S00ogcy70ySnoISOMJ9lGD2Jl+i9/bpwhI=' 
  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"
    }
  }
}