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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac117e2dd34d0da4363bfd2428cd4a0fd1e360430245e0ebfcdbe6b0204bd1d8' 
  AND token = 'jGjoK6Eg92i86JMy8wuD8PcwS14NipvOM1vZF1MDj/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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