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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21c273619b69faf1f6d8795606f2d349444d3caf3b285ee728beca27719140e' 
  AND token = '02okooWkc0yIzS/6D9HMcF7Q43XvAj/DiP3sCU968Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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