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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ae557e356aff2aa635a764eddc66af85cf0a31bca22cfd33f19b257440c01e' 
  AND token = 'PgR0t2FI4K80nPq6uWn8Y7jn83rl3c++HIh3PTYnThQ=' 
  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"
    }
  }
}