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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6612d83065a8622bbba99d85b1859db0d26ba358994fbb08844b8af61dc1f0e5' 
  AND token = 'QJrU81I+ngloqGzRgCY8PSsseCgi4XEJqG/WVj1ipz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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