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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3086d610f4e8b4cb37cb3fbd6d4dd230d664661bf9ce4e43603767a1f9fe80d5' 
  AND token = 'yPqpxXT9/7j4tWPmmB5PMVrd1yyqt2T+hd32cfrYu24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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