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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062f3a570dd4d4b4e0d6027c6ea294036a041de73aeb919aceb0c330bc60b255' 
  AND token = '558MFw2vKkiSRF9tMPBgMuOMj/fSxqZLesA5EI/WeBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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