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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b86ca9573061a948aa0bef3e11de903a26b95ff2db98fc756b704a19e660de' 
  AND token = 'WrbLQeZL6l21wU2RjlfzSROWawr6Lw546EgxqmnunJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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