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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63267df3fa9e25fef63052a09e3b611a04eb5a07255935ab65a33496b8e28ad9' 
  AND token = '0g5uEKxwNcdCe97tJERmIw7LTZ7/u7Vc0cbp1aNCClA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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