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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab83e1f833e034b07cfa4055c1d4a389b1fe4929ed609d52c590fbc5275af78' 
  AND token = 'SoCD/m6ibfQdeZ7YFZ7iyfc2U/XjAIiOd1FtHjLNEA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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