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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06429a04b4263908fb64ef4e41f7a08d3e7f9d28dfeace69ae9961f6913a238b' 
  AND token = 'OyJQDAOstTz5M3IqvnkFUIx3a4/CfcahxPaRfKgO+wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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