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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191a56f1fefd0cf0dc01bf9910d5a0b3c55e234e03eaebe4624e9d151760d2ec' 
  AND token = 'sFcE1+fnxq9Y/83ZWvzeWb89rK/wL6vS9juilIJwBo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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