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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285a967bd19a1ec44938ebb7204164f3019f6102a12588f961058c7c1e5f5bbf' 
  AND token = 'OtLRwLHbXVihcedNM5wpVnWHWb0QETFw7wswz4BNwWA=' 
  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"
    }
  }
}