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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3941fa49abfd6c3413d9af68bd708c29ae289cd2afc824a3bfb5d759e8f62a' 
  AND token = '83ADBjxrhNykMYrsuIYUSUVoHmH+dvDUT0q8AAwOUIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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