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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62459a21b259f968a0c0ba7da56179f86d17e364cd0ed00f130f1c403184fb16' 
  AND token = 'acp+G7L5mmWMiAbeSy1P4bFy5Gty70eQCXWGoweqvGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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