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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333e481dae7634bb37c1d4a42e9c2e950f0f6b0f02e7b5d29708dbfe6ed583b2' 
  AND token = 'verHqSUC2B8LEN1uz9K7hfFBWFTe8eRD8taopn1mG2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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