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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616f0847238255a6e465d09aaf1750c9ae7bf7a0cd8d19ea7a6b387a88effe63' 
  AND token = 'S6Gs5hgll34u514cT20eDTzfexTk4UiXPqVsXuhdSsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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