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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ce2608bb8c1c4e30c5d39a0a79cdebd9c9ea6023af5c48f1a265793d066631' 
  AND token = 'e4m9RHrZYF1b5NxjQMeChCviBvJTB5+QNT91fNc/qQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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